Update to v3 of actions/upload-pages-artifact

[mnlevy1981]

Description of changes:

Fixes #178 (I hope)
Our Build and Deploy workflow was using actions/upload-pages-artifact@v2, which was failing with a link to this deprecation notice. This PR updates to actions/upload-pages-artifact@v3, and I'm cautiously optimistic that the existing with: and path: are still part of the API for the updated version. I don't know if there's a way to test the workflow ahead of time, or if we just merge this in and hope the failing action starts to pass...

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[TeaganKing]

I'm also not sure of a way to test locally, but this seems like a reasonable solution. Do you want to update to v4 though? The deprecation notice seems to suggest using that version.

[mnlevy1981]

Do you want to update to v4 though? The deprecation notice seems to suggest using that version

I think actions/upload-artifact is up to v4, but we are using actions/upload-pages-artifact which wraps upload-artifact. The latest version of upload-pages-artifact is v3.0.1, but it does use upload-artifact@v4